PAC1941T-1ESLASH4MX. datasheet(32/96 Pages) MICROCHIP

32 / 96 page

PAC194X

DS20006543A-page 32

 2021 Microchip Technology Inc.

5.16.4

ALERT FUNCTIONALITY –

VOLTAGE, CURRENT AND POWER

The ALERT functionality enables the user to capture

voltage and current events that exceed programmable

limits, for one or more samples. The ALERT function

may be monitored on a digital output pin by configuring

one of the ALERT pins to correspond to a specific

ALERT

multiple ALERT

signals

using

may also be monitored over the I2C/SMBus by reading

ALERT can be triggered by a variety of triggers; VBUS

overvoltage or undervoltage (OV or UV), VSENSE over-

current or undercurrent (OC or UC), overpower (OP),

conversion cycle complete or accumulator/accumula-

tor count hitting a limit for fullness or overflowing.

The OV, UV, OC, UC and/or OP limits must be enabled

for any of the channels that will be using them, by set-

ting a bit in Register 7-34. These limits are specified

with two’s complement values independent of whether

Unipolar/Bipolar Or Unidirectional/Bidirectional modes

are set for VBUS and VSENSE measurements. Only

ALERT conditions that are enabled here are capable

triggering

any ALERT. A

REFRESH

(or

REFRESH_V/G) command is required after writing to

5.16.5

ALERT THRESHOLD LIMITS

Each channel has programmable 16-bit limits for

overcurrent,

undercurrent,

overvoltage

and

undervoltage. The overpower limit is a 24-bit number.

The thresholds for these ALERTs are set in

5.16.6

SAMPLES OVER LIMIT TO

TRIGGER ALERT

The user can also program how many samples must

exceed the threshold to trigger the ALERT pin (over

limit samples). The default value for over limit samples

is 1 (up to a maximum 16 samples), which means the

ALERT will be triggered on the first sample that

exceeds the threshold. For OC, OP and OV, exceed-

ing the threshold means a sample that is of larger

value than the programmed limit. For UC and UV,

exceeding the threshold means a sample that is of

smaller value than the programmed limit. The OP limit

differs slightly from the other limits in that it is always

magnitude based. Thus a more positive value or more

negative value will trigger an OP alert.

The user can program how many samples over the

threshold are required to trigger the ALERT for each of

these parameters in Register 7-28, Register 7-29,

5.16.7

ACCUMULATOR-BASED ALERTS

The ALERT function can also be programmed to

trigger when the accumulator or accumulator count for

any channel is filled to a specified amount. This

amount can be programmed from 15/16 full through

7/8, 3/4 or completely full. This enables the user to

maximize the accumulation time instead of simply

planning for the worst case. The limits for each

channel are specified in Register 7-23.

When the ALERT is tripped, the user can interrogate

which channel(s) or if the accumulator/accumulator

count condition triggered the ALERT. The ALERT con-

dition is cleared when these ALERT cause registers

are read, specifically when the register that caused for

the specific ALERT cause is read.

condition, it does not require a REFRESH command.

When the ALERT function is tripped by accumulator

overflow, it remains asserted until a REFRESH com-

mand is received. REFRESH_G will also clear the

ALERT bit and the ALERT function, but REFRESH_V

will not.

5.16.8

ALERT CLEARING AND

PERSISTENT FAULT CONDITIONS

the

over/undervoltage,

over/undercurrent

overpower conditions that tripped the ALERT or accu-

mulator full conditions are still present after the ALERT

cause register is read (which clears all the bits in that

function will reassert, if the next converted sample that

detects the limit is exceeded.

condition is still present after the next conversion cycle

is complete, the ALERT is reasserted.

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